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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c58e6a7eec6c36254ce5dca68321af73f3f01b5a4898c13b7176d0fd0ca96f' 
  AND token = 'iZF7pmrynPTMsl23WX8QzhdFNDNGY1BNI7UrujUvp7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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