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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ce8c9bce26d36cb829903c57eed76f9bb8a970e3c09d6d128a88a11b191253' 
  AND token = 'GzKcN+sO4e5u1u8WJ5dLky/Vpov8U1bHoDkvput3ihc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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