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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f301d0bc8e7c3e2a950f1d3cb4f84e03ff5890007248a21f3f0cc9074287269' 
  AND token = '5kMwph+GoaiDYXD9AUi3RVGauUkJ9NcIX/4N6JCXTPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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