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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '779283a12022935f8850983da5a8db7ae8d9cee6b27258d42be7db8ceebe1cba' 
  AND token = '9yA+ts2vrxjfSE82K45XbGnioXnnqQyCzvJ5MTsmJ1w=' 
  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"
    }
  }
}