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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ac0ed25f5387ffa81c81105b105c56bc494c7a8a470f1732e98bb20bbf7c38' 
  AND token = 'YMiuylCTW0e28qjoabVf1b4FWDobPCxouCzHmXUwYqo=' 
  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"
    }
  }
}