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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dea2fe68cc7bee87d0196590551b7628058d26c9a902e48a45e7a9fc952ba9c' 
  AND token = 'Lq3YJ+m+HN0oyoIHIdDHEl0tqNCpRoNyWGh3cgAXeq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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