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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd66f7170822fc07e7e7079dfd6715978ec0edf3cd70ab1e4c8c3cd6630793f0f' 
  AND token = 'O865AudU/M0mnzL0CZZV12VIaAv1lwfYb/5lt5DyibU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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