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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9669bb22b513217e05e5472bd3753f33b4c65609ec16ee38d6612288320f41' 
  AND token = 'MQz3d64R69t3MOro+w3+UP91cZVf+3MSqWch51WFDtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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