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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149ab6dd2c75c76b5245ecb0c3db7686e147ff000d1e58fce1cd08138f1a8c58' 
  AND token = 'zZ311DiyKAyuRtiE3ll2PvyMdEuGBhvOZ2vZGqiDp/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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