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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7299c46f54fe6495c8f0097a8f67ca748c2b1540d60578bdb1bf70cfa8c842' 
  AND token = 'O5hve1MkbaRR8LOd7/9rRSrKNLtESt6qKLr/LJ0TJoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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