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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c16308562bcf03301482bd76a111db4d2113e140828b2348ee3a9ff9d9156911' 
  AND token = '5fTnMVKi49btJluZZWX/f/tgciuU2Y2k5ibHher4jJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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