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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd0ae30483321731785eb61646a1fa1f3f4e89fbaabfbb4782f74db6122ccb4' 
  AND token = 'R8V2w+O0pVT06E7RoHUVrPorQWf7Cb0EnyEV7ZwswEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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