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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a32d0bf4a3f78fcec8535e3bf0ea787199def6315cde7c36b44f5311791d23' 
  AND token = 'Bpwk1eJrii5BvYiH2VWYlKcNDCGI5AenKO89cH5WIf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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