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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5fcf2f2a2fe2050eb4455e14175ba5c7b7fe9434df28dae448173da9081362e' 
  AND token = 'hbt0kZPWftqOJMQNXCSyBgyEL96k/rTu10GjleqQVVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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