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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f61b25ceceb004e417e990fa01330cf50bb96ebd1b8c6f6f87d1ffcc748dcb' 
  AND token = 'hwRORB/3H/9tionqyb58uoHRGLMIPlQ6vi6/VYOVnms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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