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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '406977fb20906bf3fc82b6ab5f55787d483a09e8562e94576d36db8603eda3f9' 
  AND token = 'qBaKHNM32Kf86WTaGQ5Sm0uXmtR5UXE6z85+dDnIIhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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