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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90cedc628cb819b619b393555aa74397931cf66847cad22c6c1cd28c2f766118' 
  AND token = 'COA2H/HERJ2EnwCM6JxGwMQWE0eDGrPASI3vIY6AExs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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