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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09fbb89cfcaebbce8fc41954d7fdf2c617d854d4783f4837897db5ea0d89b45' 
  AND token = 'ngIbWAm/JO9eBRis0jMvW0ja5jacZgrBD2NXHVAi2II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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