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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c8466fef6109b5c3d948c7138902062d8c6b4546085622b5c1c544569334484' 
  AND token = '4/cCgOQUmqbK7ENdfnwkGJzpDECppZPNsRJx7zHRnw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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