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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e85a4514704844c5085871edf5be725f3f53b7ae339cfca9f9304b9ad24579' 
  AND token = '+wV/sZfbsx29s/NmNc84s/hriNawZG1bgRGQ/nTxb2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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