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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda04113f24cad7f325d1a3922bb7f1ea4ded618181d70f1f225a45561cf4f48' 
  AND token = 'M7caZOWU817ZyvAdKCaHtSTM7glrKTWTHwwrvo9O32s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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