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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d5c82cd2d1fdc3542417e7a8ff5f7a33cdcefe87e79284bfec5a7436e2e5d2' 
  AND token = '5naOER5DOvdYHVZT+yCdVoVcrZLKOk0yxe9+vT1vEcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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