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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8224df5a132fffe40a267449641922c736e4c834358e836c905b96569647671c' 
  AND token = 'u9H8wl4+SXGuakK1obXA81/FWS7YbIPp4WRQwdhElSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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