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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28f8fb24ca88b024e4ff4adb19ca77674167590baeeff3d8a3adee2887fad9e' 
  AND token = 'JSj7QTWOKz08p6k6PrlzX+hLCqYYcSe4M0kVXXaBJJ8=' 
  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"
    }
  }
}