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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93a7e2d1d5ba99a21ef5fe933fe78a01d324cb5b35db9c75c8b08fffa8cb62f' 
  AND token = 'ZWT6LTAMI3KUnTL4dK8G8SVwy6Ilj88VIbyFRyNN1pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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