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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47015d929aef8f96388987c413d296bd7d412c7e48d09fe75528437ce9293c6' 
  AND token = 'wrxmOwlgCbZhyD75Tq2O05DEwq3H07cmXpA9ez4lvYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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