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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3138634f5495b331955f8954754b111dbb781d20046d5276c23d474c800157' 
  AND token = 'XEDP9tvOna7AgsofgRe6jHbUFgiy2RP59Q71EUWqfqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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