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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64d51854d2b2025b328249a2f236f6f7861b5cb8e2de5dc920260694e3fea0f' 
  AND token = 'l/dxsysIz6FD2SJnF0+Nkk7pJw+y0ev8LNkAGaMuTIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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