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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef4ca52c4bf3ac39d7dfff9d53ec0c646d1004d5404d628b8c9926f0cac7fbb' 
  AND token = 'V5wEUEkH1VBG7Ouy6q+V3WSiJIXdKNvzrDo5gycoxnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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