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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ca1b2fc96193189f52f61f199e488b7194d5a96c0b83f87230d464cfe33945' 
  AND token = '13WswCsm2vfcUQxlhBKZTLMmqWXi9A5o7pzMI3rES6U=' 
  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"
    }
  }
}