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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ce0ddcdfe68be9ca43b16fdd06e5ea6f6e446f1cf1deaa121502c452522121d' 
  AND token = 'z1ZjLQGyfTwXBnCgTkd+odtV35mKM+M+wi2e7Cqy6zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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