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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66caa6c0cd3d743d155bcdadbbe32521e277cf33c45600d1422ab4f00472cc80' 
  AND token = 'WlDYE8bjxX+PBd8VqWFhxJtfPQ3f78PNX4dCl4r4CfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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