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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd13fddbbe16f08153b6ac0f7f0fdef059ff939661088ef1d9f6f5ccf9cd0c65' 
  AND token = 'g+11Y5Xvhy3hfdmClMRUpmXY4edsEghDeDUGforRbC4=' 
  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"
    }
  }
}