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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401a780bbd332beb3d54b43b8699ef5ba184f005aee635d46a998701f16708f7' 
  AND token = 'e46y7P3QZc7Yk4w0skPIvnawyf2BRY02yBpdTsSurzg=' 
  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"
    }
  }
}