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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24fe0b673b19125fa10d910a56aeffea3f193419ec5d84a7c3938b56eed745ee' 
  AND token = '0beZkBAxSfC8R494XLbesUNUkyjAZdO+F+ekFJ9BIqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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