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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bafb52ba9c192f3b8c2e81f415977b82da9135ba41c3a0e17d70be9911a8513' 
  AND token = '86FcqPDablOogtKC0/OYJ2peJwQLOD8MmdboPdnAMtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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