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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e5194e268a3d75508bd4b253f10e8655f63a17afc7f428e6149b918e36dcc2' 
  AND token = 'lhMBzg/CpmNnpR4oaYaoyPpT+HSxgonOmy909Cp5YhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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