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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5ee5f0da37f4d332943782214c56e72b3c4c8ffa5364c31ab2a15a0d91237e' 
  AND token = '/EoTcYETSZPob2xWB3YU6162QO/Ybdu/E8cNX72WRy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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