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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b33a7a7d57981b30a949ede0f3780f743d89cd9eb6f0ca14c453c75f0e888b9' 
  AND token = 'HgK3nV4QOqJGKpYQrxHST57l8hyo3yQd4lJj0IpOh1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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