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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bae9e057074fd5cad75fd4fe56603da96def1daeebbea95325240f1f309a977' 
  AND token = 'c0e4UXW1PzDDOMp0tvn7WVE+bNrYA4iq4qlVKaszMzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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