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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e8f12a89a28e7afb470b1d9e5a6853b5ee44507978e44572aa2f10d387992ec' 
  AND token = '55127Zawp/3HTIAwh5WchPprNx/JufkWAFpedph6m3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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