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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af950d3dcd91527441d8f7e363097d986595acc849a281067a8af2417cdd6ee4' 
  AND token = 'ZAlmxWj3C8qfSsihuSvvzhT+SD6ayTuKtxUTto+jES0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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