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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c788ffcad5778613eef4cad8d5dd89ab47b23e1f007deb6929993c6a58624b' 
  AND token = 'nFFkRiU4us5T0vI4S+8JKnQyfppe2GYrNKLdaTA8rTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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