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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82fcb49db5edc740c5ee194991689d030db41f122ed958e87e9b3f9d0f1c9820' 
  AND token = 'S8BISyT/PIJyoK2fN+DoSphInSg2ImVgMVjO6pHnyNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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