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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78f67e78cf8688d3cdc3b670cd05b5e569c9f595b0a61a71c7f0ed6cb7df5615' 
  AND token = '4ImIxvXsWeO3UdcmQhtwa1N8WQZRdvN0X+otvkdCaw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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