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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79725ae3d4f711a70f9ff553908d5494dde10f63fd95593b90d732090da5deaf' 
  AND token = 'e+NyUW6/o7giyrz0c+QXhdgzNIqoFkyK05XssRm0rcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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