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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fefca64d609f4521c13309141ca035334a5b8dd71c4051a7383e070f90027c8b' 
  AND token = 'y7YlJsHN0omMrG240MJHJ4t2ZMttUYNl/TCprW7NBs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00298

JSON explain

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