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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d80eaf34938b9321f4f7ee08f454d9d6f351b18616d3ae56f1a54eab6656b8f' 
  AND token = '4MIDWf5bzjCND4WWXJrTRp89Wh258jH0QpkiXPTeU5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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