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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2098a566d8dea6a8a0bfbdd1e4c4ca285f735d8cf22a6385bde7de43ee13033d' 
  AND token = 'sz7MaUYLEaibpb0DY1M3wpnL/sA9hdMnaFIQ8cEiFIE=' 
  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"
    }
  }
}