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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd0396921d8fc65d10bc7c6cc05c4fee2e5bfd3236df9c2a9584abf9065eaff' 
  AND token = 'e0VFyzFk2yLnv40D6nG1Q+xug0BiVBxHry/R/7KbJRo=' 
  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"
    }
  }
}