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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd908ac3cc7c2bf6fcbdba4e0c5b164a590444d470b1e53367a5ac9c62da8afd0' 
  AND token = 'g32x9W3w6GIYIeqyM6mHC6em78HCnZJfJbIKfNZMrrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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