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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '499e2ebdd267e7f299645fa6fb124e1520590968b8fa4a41f120c5c99f1156b0' 
  AND token = 'CTqQaQfM6xeHbHzwpaN0MOkFXsKSungDOwuMOApEERA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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