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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e4240b7e350b070079f396624ca52e1de3eec19fba18ddf8a607f136100cd19' 
  AND token = 'fCk993V4MpQSiv0KZ3KQNZj/nyo9ZP1P2P/CYB78+c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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