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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db58dbc84da17dc2da3348dad4a4914b7343f04a8681d3af98b6a76581056673' 
  AND token = 'FnAngdD3jjbTaFhJCRHDWDF4y6sYIjL77MYrod3pBP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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