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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa3bb00a6aadd833c3a04a320d15e1ed57a9c50aea19fe94b8751ac5191f723' 
  AND token = 'a4mFG5rwsRUiE5zEaSQkE2zR+y+K7De2JS7QFgsZLqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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