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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2ee3e8da0370f6de09c51211aa4e5124bb7bef5a956e90a6c5b2c1cba1f824' 
  AND token = 'NxTr04g9S98e8g33/z3C35PY51inZ4TrtEBvXHz5pNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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