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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5f9746b507813b2b542c211b6e43b331eea98474f5b48eddd8c0ff573d3889' 
  AND token = '36bYXqqgWyAOYQnQZb2eV/B7o4cm7yj4dXG31/CpN4o=' 
  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"
    }
  }
}