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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f739d6c36206f9ec9fcef26304b1332d567003b72e7c1cf2cfdd700e8421e1d6' 
  AND token = 'VJ2DZu943b5xTXC0utS9A6/UGEBBfQx72q67wvAdH4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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