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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe918c7de422cc4848a4087b8c4144a639d7487486814cc4cbce81aafcf68c4' 
  AND token = 'ndPEmwXS2KW833xnbHsahskzy8lpurSi5D3k/q10yNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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