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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf037db54983e707ec2d9c62e15309ab4b65d93eae614b7ad226d2a9f619c5b' 
  AND token = '2CHp0GgOK1sVIrl+ADJ2UXL75uYkWuaK4dYtlb0rGgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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