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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf6a492208b0dae20c356c8dbaf24905532881300c3711b4084e5b9e06a52eb' 
  AND token = 'GjhyXS8Ric8G7oxkulzyFE/A5iSYcxDS4ZEDT5sOEe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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