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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87d6651308ecd54aa39fb9b17dc3bb04d4fe8b6b68bfc6ad3f69dbf7ec2ffd6' 
  AND token = 'RHvNVSZ+6GY/rHxxbHy4RWXZLuR9cJ1fohq2HyNn8JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}