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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364c05ff4056163493c1ab8f360c5796879a6bc4bd907f4b78b64698380e2f8a' 
  AND token = '4Xq17GhgU8p0OLopzmLL2fjogUM2z9mGCEwsix7HgIc=' 
  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"
    }
  }
}