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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ee4c8cc8150acc8e9ed75dbe5fb429d8e09aef47b54306f6daa07280eaa460' 
  AND token = 'X2ijodzgCpOVTBsy4RIDOhlaXofC/0lFN+i5vGUGgh0=' 
  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"
    }
  }
}