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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c05b09229846d38fa0ca52066180f567d346433c0c3461cfa1247a1c75c7ae' 
  AND token = 'qTiypQW+maWR15iWGa2cVsoD+sJ1R/zERnezyvD5y1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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