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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d2eefc02f0045c2f33debbf0a32d112d4cffea6c21ecba92c1c16461f6ea4c' 
  AND token = 'HTmIVblXZkuKPjJd/GFF+EmOKSuw/73xLo/MSdTwB7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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