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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a39de2e612d3bd97f5a7408f1a5a03fa7d3b967f39cf035e86ce5c8d8ec017a' 
  AND token = 'Lp4hsD/AStjrQvR402FimZXpYdGqp0PTYlkjp5SnFGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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