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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce0c6f93f2b5351f345d8295857e449e3dc123a505e9b65876fa8a1ae140e6a' 
  AND token = 'U5L7dmsl9NiJf5iEY5+TRlEqWzVS1S3Su0x7fCQ4hGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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