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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cb3c925d1a29b53985d610917e2680c1a0c67df7d5f8fb63254b1de52a2419' 
  AND token = '9CXr7+C167IROGZ+/00B7rDP6s9N3i5KuOkheePgyq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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